Breshad Perriman doesn’t play special teams, but on Wednesday — and at the start of pretty much every practice since the regular season began — he’s on the field early with the Ravens who do. Perriman and his position coach, Bobby Engram, find an empty swath of grass and run through a series of routes. After practice, Perriman is with fellow Ravens receiver Mike Wallace at the JUGS machine, catching balls at different speeds. Perriman’s struggles since he was selected in the first round of the 2015 draft aren’t because of a lack of effort, his teammates and coaches say. Clearly, his problems are not a byproduct of him lacking desire either. The Ravens who know him best — and he doesn’t let a whole lot of people in — say he cares deeply, perhaps too much. An inability to play through a knee injury in his rookie season left Perriman so distraught that he barely communicated with teammates and coaches. He’s 6 feet 2 and 215 pounds, prototypical size for a receiver, and he’s not too far removed from running the 40-yard dash in 4.24 seconds. Yet, those traits haven’t translated to success on the field. Perriman, 24, has continually been rendered a nonfactor on game days, further weakening a Ravens offense that struggles to create big plays downfield, the exact thing the wide receiver was drafted to provide. It’s become a weekly refrain in the locker room at the team facility that Perriman just needs to make a play or two to turn his season around. It was said this past week as the Ravens prepare for Sunday’s road game against the Tennessee Titans in a key matchup of AFC playoff hopefuls. However, even Perriman seems to be at a loss for what needs to change in order for that to happen.